<template>
  <div class="app-container">
    <div>
      <h2 style="text-align: center;">发布新课程</h2>
      <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
        <el-step title="填写课程基本信息"/>
        <el-step title="创建课程大纲"/>
        <el-step title="提交审核"/>
      </el-steps>
    </div>

    <div>
      <el-button type="text" @click="dialogChapterFormVisible = true">添加章节</el-button>
      <!-- 章节 -->
      <ul class="chanpterList">
        <li
          v-for="chapter in chapterNestedList"
          :key="chapter.id">
          <p>
            {{ chapter.title }}
            <span class="acts">
              <el-button type="text" @click="dialogVideoOpen(chapter.id)">添加课时</el-button>
              <el-button style="" type="text" @click="getChapterInfo(chapter.id)">编辑</el-button>
              <el-button type="text" @click="confirmDelete(chapter.id)">删除</el-button>
            </span>
          </p>
          <!-- 视频 -->
          <ul class="chanpterList videoList">
            <li
              v-for="video in chapter.children"
              :key="video.id">
              <p>{{ video.title }}
                <span class="acts">
                  <el-button type="text" @click="getVideoinfo(video.id)">编辑</el-button>
                  <el-button type="text" @click="confirmDeleteVideo(video.id)">删除</el-button>
                </span>
              </p>
            </li>
          </ul>
        </li>
      </ul>
    </div>

    <div>
      <el-form label-width="120px">
        <el-form-item>
          <el-button @click="previous">上一步</el-button>
          <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
        </el-form-item>
      </el-form>
    </div>

    <div>
      <!-- 添加和修改章节表单 -->
      <el-dialog :visible.sync="dialogChapterFormVisible" @close="dialogChapterClose" title="添加章节">
        <el-form :model="chapter" label-width="120px">
          <el-form-item label="章节标题">
            <el-input v-model="chapter.title"/>
          </el-form-item>
          <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogChapterClose">取 消</el-button>
          <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
      </el-dialog>
    </div>

    <div>
      <!-- 添加和修改课时表单 -->
      <el-dialog :visible.sync="dialogVideoFormVisible" @close="dialogVideoClose" title="添加课时">
        <el-form :model="video" label-width="120px">
          <el-form-item label="课时标题">
            <el-input v-model="video.title"/>
          </el-form-item>
          <el-form-item label="课时排序">
            <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
          </el-form-item>
          <el-form-item label="是否免费">
            <el-radio-group v-model="video.isFree">
              <el-radio :label="Number(0)">免费</el-radio>
              <el-radio :label="Number(1)">默认</el-radio>
            </el-radio-group>
          </el-form-item>
          <el-form-item label="上传视频">
            <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/eduvod/video/uploadAliyunVideo'"
              :limit="1"
              class="upload-demo">
              <el-button size="small" type="primary">上传视频</el-button>
              <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                  支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                  GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                  MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                  SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
              </el-tooltip>
            </el-upload>
          </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
          <el-button @click="dialogVideoClose">取 消</el-button>
          <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
        </div>
      </el-dialog>
    </div>
  </div>
</template>

<script>
import chapter from "../../../api/chapter/chapter"
import video from "../../../api/video/video";

export default {
  name: "Chapter",
  data() {
    return {
      //=========章节============
      saveBtnDisabled: false, // 保存按钮是否禁用
      courseId: '18', // 所属课程
      chapterNestedList: [], // 章节嵌套课时列表
      dialogChapterFormVisible: false,
      chapter: {// 章节对象
        title: '',
        sort: 0
      },
      formLabelWidth: '120px',
      //==============小节============
      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      dialogVideoFormVisible: false, // 是否显示课时表单
      chapterId: '', // 课时所在的章节id
      video: {// 课时对象
        title: '',
        sort: 0,
        isFree: 0,
        videoSourceId: '',
        videoOriginalName: ''
      },
      fileList: [],
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },
  created() {
    console.log('chapter created')
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id
      this.initChapterList()
    }
  },
  methods: {
    //===================小节操作=====================
    dialogVideoOpen(id) {
      this.chapterId = id
      this.dialogVideoFormVisible = true;
    },
    saveOrUpdateVideo() {
      this.saveVideoBtnDisabled = true
      if (!this.video.id) {
        this.saveDataVideo()
      } else {
        this.updateDataVideo()
      }
    },
    saveDataVideo() {
      this.video.courseId = this.courseId
      this.video.chapterId = this.chapterId
      video.saveVideo(this.video).then(response => {
        this.$message({
          type: 'success',
          message: '保存成功!'
        })
        this.helpSaveVideo()
      })
    },
    getVideoinfo(id) {
      video.getVideoInfo(id).then(res => {
        this.video = res.data.data
        this.dialogVideoFormVisible = true
      })
    },
    updateDataVideo() {
      video.updateVideo(this.video).then(response => {
        this.$message({
          type: 'success',
          message: '修改成功!'
        })
        this.helpSaveVideo()
      })
    },
    confirmDeleteVideo(id) {
      this.$confirm('确认删除此小节？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        video.deleteVideo(id).then(res => {
          this.$message({
            type: 'success',
            message: '删除成功'
          })
          this.initChapterList()
        })
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
    },
    dialogVideoClose() {
      this.dialogVideoFormVisible = false
      this.helpSaveVideo()
    },
    helpSaveVideo() {
      this.dialogVideoFormVisible = false// 如果保存成功则关闭对话框
      this.initChapterList()// 刷新列表
      this.video.title = ''// 重置章节标题
      this.video.sort = 0// 重置章节标题
      this.video.videoSourceId = ''// 重置视频资源id
      this.video.videoOriginalName = ''
      this.saveVideoBtnDisabled = false
    },
    //===================章节操作=====================
    initChapterList() {
      chapter.getChapterList(this.courseId).then(res => {
        this.chapterNestedList = res.data.list
      }).catch(err => {
        this.$message({
          type: 'error',
          message: err.message
        })
      })
    },
    saveOrUpdate() {
      this.saveBtnDisabled = true
      if (!this.chapter.id) {
        this.saveData()
      } else {
        this.updateData()
      }
    },
    saveData() {
      this.chapter.courseId = this.courseId
      chapter.addChapter(this.chapter).then(response => {
        this.$message({
          type: 'success',
          message: '保存成功!'
        })
        this.helpSave()
      }).catch((response) => {
        this.$message({
          type: 'error',
          message: response.message
        })
      })
    },
    getChapterInfo(id) {
      chapter.getChapterInfo(id).then(res => {
        this.chapter = res.data.data
        this.dialogChapterFormVisible = true
      }).catch(err => {
        this.$message({
          type: 'error',
          message: response.message
        })
      })
    },
    updateData() {
      chapter.updateChapter(this.chapter).then(res => {
        this.$message({
          type: 'success',
          message: '修改成功'
        })
        this.helpSave()
      }).catch(err => {
        this.$message({
          type: 'error',
          message: response.message
        })
      })
    },
    confirmDelete(id) {
      this.$confirm('确认删除此章节？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        chapter.deleteChapter(id).then(res => {
          this.$message({
            type: 'success',
            message: '删除成功'
          })
          this.initChapterList()
        })
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
    },
    dialogChapterClose() {
      this.dialogChapterFormVisible = false;
      this.helpSave()
    },
    helpSave(){
      this.dialogChapterFormVisible = false// 如果保存成功则关闭对话框
      this.initChapterList()// 刷新列表
      this.chapter.title = ''// 重置章节标题
      this.chapter.sort = 0// 重置章节标题
      this.saveBtnDisabled = false
    },
    previous() {
      console.log('previous')
      this.$router.push({ path: '/course/info/' + this.courseId })
    },
    next() {
      console.log('next')
      this.$router.push({ path: '/course/publish/' + this.courseId })
    },
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.data
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    handleVodRemove() {
      chapter.deleteAliyunVideo(this.video.videoSourceId).then(res => {
        this.$message({
          type: 'success',
          message: '删除视频成功'
        });
        this.fileList = []
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
      }).catch(err => {
        this.$message({
          type: 'error',
          message: err.message
        });
      })
    },
    beforeVodRemove() {
      this.$confirm('此操作将永久删除该视频, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        this.handleVodRemove()
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
    }
  }
}
</script>

<style scoped>
  .chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chanpterList .acts {
    float: right;
    font-size: 14px;
  }
  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }
</style>
